989
FXUS66 KPDT 012236
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
336 PM PDT Mon Jun 1 2026

.KEY MESSAGES...
- Dry conditions with warming temperatures through Wednesday.
  Cooler thereafter.

- Mountain showers and thunderstorms Wednesday, and again
  possibly Friday into Saturday.

- Breezy to windy conditions Wednesday and again Friday into Saturday.

&&

.DISCUSSION...
An upper low continue to spin across Montana and southern
Canada. It will gradually move eastward. As it does, the broader
trough over the Pacific Nortwest will move as well, and weak
ridging will move in for Tuesday.

A quick moving trough will then follow for Wednesday. This
trough and associated upper level energy will bring a chance of
showers, and a low (<20 percent) chance of thunderstorms, mainly
to the mountains. Precip chances will continue into early
Thursday, mainly for the eastern Oregon mountains. There will
also be breezy to windy conditions as the trough moves through
with wind gusts 25 to 35 mph with gusts as high as 40 mph in the
normally breezy areas. NBM probabilities of wind gusts >=39 mph
range between about 40 and 80 percent across the area.

A more zonal flow will move in for Thursday, drying things out.
Then, an upper low and trough will move into the Pacific
Northwest beginning on Friday. While the main upper low will
likely move along the Washington/British Columbia border, the
broader trough will move through the Pacific Northwest, with a
more zonal flow returning Sunday. The main impacts will be
showers and possibly thunderstorms over the mountains.
Additionally, breezy to windy conditions will develop Friday
afternoon over the lower elevations and peak on Saturday. Wind
gusts of 35 to 35 mph with gusts to 40 mph are possibly in the
normally breezy area...the Cascade gaps, Simcoe Highlands,
Columbia Basin and Gorge, and foothills of the Blue Mountains.
NBM probabilities of wind gusts >=39 mph range between 40 and 80
percent across this area on Friday, and about 50 and 80 percent
on Saturday.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
VFR conditions prevail. Winds remain light at less than 12
knots and will be terrain driven at times. No impactful weather
expected that will bring low VIS and CIGs.

&&

.Preliminary Point Temps/PoPs...
PDT  48  81  50  79 /   0   0   0   0
ALW  52  81  54  81 /   0   0   0   0
PSC  51  85  52  84 /   0   0   0   0
YKM  53  84  54  82 /   0   0   0  20
HRI  50  84  51  82 /   0   0   0   0
ELN  48  79  52  76 /   0   0   0  30
RDM  41  82  49  74 /   0   0   0  10
LGD  44  79  46  79 /   0   0   0  20
GCD  42  83  46  79 /   0   0   0  20
DLS  57  87  60  78 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
WA...None.
OR...None.

&&

$$

DISCUSSION...77
AVIATION...95